Stair structure



June 12, 1928.

N. BOIS STAIR STRUCTURE Filed Oct. 19, 1927 3 Sheets-Sheet lNVE/VTQR NATHANIEL B OIS.

lqrrr June 12, 1928. 1,673,178

. N. BOIS STAIR STRUCTURE Filed Oct. 19, 1927 a Sheets-Sheet 2 MIKE/V7012 NATHANIEL BOLS.

rrx I June 12, 1928. 1,673,178

N. BQIS STAIR STRUCTURE Filed Oct. 19, 1927 3 Sheet -Sheet 5 4 /Z 4 l/WENTO/K NATHANIEL 50! s.

Patented June 12, 1928.

uru'r 'ao STATE-S NATHANIEL 1301s, or SAN rmmoxsco, CALIFORNIA STAIB STRUCT RE.

Application filed October 19, 1927.1 Serial No. 227,254

My invention relates to improvements in stair structures, wherein stair forms mountedfbetween a pair of stringers operate in conjunction witheach other and with tie rods between said stringers, for combining the whole into aninterlocked stair.

The primary object of the present invention isto provide a new and improved stair structure. r a

Another object is to provide a new and improved structure of the character described wherein a plurality of integrally formed risers and treads are providedwith improvedengagingfmeans for engaging adjacent treads and r'iserswhereby said treads and risers may be efiectively locked together.

A further object is to provide a plurality of improved stair forms having engaging means for connecting them, said engaging means being also arranged to be engaged by tie-rods to lock said forms in engaging relation and to support the same between a pair of. stringers.

' A still further object is to provide a new and improved stair form a of the type set forth, andhaving a simple, effective and economical structure easily made and assembled into engaging relation with each other;

A still further object is to provide a new andimprovedstair structure wherein all of the stair forms are effectively locked together and supported between a pair of stringers by means of the tie-rods connecting said stringers. H i a 1 I accomplish these and other objects by meansof theimproved device disclosed in the drawingsforminga part of thepresent application wherein like characters of reference are used to designate similar parts throughout the specification and drawings, vand in whichi f j lis a broken vertical sectional view of my improved stairstructure "in section; with the near stringer removed; H i 3 s a in section;

form;

Figs. 5 aud t arej sectional detailed viewsi Fig. 7 is an enlarged broken sectional view of a modified form the invention;

Fig.8 is an eleyationof the top of the 'rise'r'of Fig. 7, shown detached from the stair tr s ure; n i i Fig.9 is a jsectional view disclosing the broken front elevation, partly r g r I 1 forms 2 are also rigidlyheld between, said {is a' perspective view'of one stair manner in which the parts of Fig. 7 are held together.

Referring to the drawings the numeral 1 is used to designatea pair of inclined stringers between which are mounted, in amanner hereinafter morefully set forth, a plurality of integrally formed treads and risers, or

stair forms 2. Eachjform is provided with a riser 3 having hooked lugs 4 formed in. tegally with the top ofisaid riser 3, and an arcuate recess 6 extending rearwardly from the lower portion of said riser 3. A pair of struck up apertured lugs? are formed with in each recess ,6 to engage a'supporting tierod 8. Instead ofthe struck up apertured lugs 7 struck up hooks 9 may be provided,

as disclosed in Fig. 5 of the drawings, which hooks 9 will be equally effective in engaging its respectivetie-rod 8.

Each stair form. 2 is also provided with a tread 1 0, and adjacent the front end or portion of each tread 10, suitable apertures 11 l are provided, as disclosed in Fig. 4 of the drawings. through which apertures 11 the hooked lugs 4 of the riser 3 below the tread 1 0 may be passed to therebyiengage said tread and a tie-rod 12 resting upon said ltread l0 and extending between the string-- ers 1. a r

The front edges ofthe treads 1O may be turned upas at .14 to form a pocket on said tread lO'in'conjunction with the arcuatere- 'cess 6] of said form, as hereinbefore described.

Thel ltierods 12 are the real supports as they engage the hooked lugs 4 on the top edge of the risers 3. and support said riser. As the tread above said riser rests uponit, it. is obvious that thessaid tie-rod also supportsthesaid tread.

" Thetie rods 8and 12 are providedwith heads 16 at one end and with suitable nuts" p 17 at their opposite ends whereby the string- Fig. 2 is abroken perspective vview, partly ers '1. may be secur'elyiand rigidly connected together with thepstair forms 2 between them acting as separators, whereby said stair j tweenthe stringers land after one form is in position and'supported by the tie-rod 8 the hooked lugs 4 of the riser 3 are passed through their respective apertures 11 inthe adjacent tread and the tie-rod 12 is then passed between the hooked lugs 4 of said riser3 and the tread 11 thereby locking said tread and riser in engaging relation, as disclosed in Figs 1 and 2 of the drawings. Successive stair forms 2 are similarly assembled until the whole structure is completed, After assembly the nuts 17 are screwed up.

tightly to draw the stringers 1 tightly and rigidly against the'ends of the stair forms 2 thereby providing a rigid structure throughout. I p

If desired, instead of insertingthe hooked lugs 4 through an adjacent tread, the entire top edge of the riser may vbe rolled to form a hook and the adjacent tread may restupon said rolled edge and be supported thereby as: disclosed in the upper right hand corner of Fig; 1 of the drawings, v

This will dispense with the apertures in the tread and at the same time the tread resting on said riser will also be supported by the tie-rod 8 passing through the apertured struck-up lugs 7 or hooks 9, as the case may be, at the rear edge of the said tread.

In 7, andn9 I have disclosed a modi fied form of the invention wherein the hooks 4 on top of the riser 3 engage the rod 12 which this case lies under the tread 10 of the form 2 above itand additional flat or lateral members 3 extend through the apertures litand are utilized to engage the top surface of the tread 10 and prevent the same from separating from its respective supporting rod 12.

In, this form'of the invention the same simple arrangement of the top of the riser 3is maintained. The top edge of said riser is slit for a slightportion, asdisclosed in Fig. 8 of the drawings and two of the pen tions :are bent or rolled into the hooks 4 while the intervening portions are bent laterally to form the flat lateral. members 3 to extend above the tread 1O otthe form aboveiit.

, The assembled structure ofthis' modification is more clearly shown in longitudinal section in Fig. 9 of the drawings.

Having thus described my invention what I claim as new and desire' to secure by Letters Patent is,

1, In a stair structure, a stair form comprising integrally formed riser and tread members, the said riser being provided at the top edge thereof with hooks to engage a tie-rod, and each tread being provided with apertures through which said hooks may be proiected from below, whereby said forms may be locked together and supported apertures in said tread.

:by attic-rod above the treadand engaging the hooks of the risers passing through, the

2. In a stairflstructure, a stair form comprising integrally formed riser and tread members, the said riser being provided at the top edge thereof with hooks to engage between a pair of stringers bysaid tie-rods 3. A stair form comprising an integrally formed tread and riser, said riser bein pro vided at the top thereof with hookelugs to engagea tie-rod, and provided near the bottom thereof with an arcuaterecess ex tending rearwardly of said form, and tore ther provided within said recess with struckup aperturcd lugs to engagea tie-rod. the tread on said formbeing provided with an up-tur-ned front edge to form a pocket with the arcuate recess, and further provided with apertures to receive hooked lugs from a riser below it. t r i 4, A stair structure comprising a pair of stringers; stair forms mounted between said stringers, each form comprising a tread having hooked lugs formed on the top thereofto engage a tie-rod, and each tread being provided with apertures through Y which the hooked lugs of a riserbelow itrmay be ,projected; and tie-rods supporting the stair forms and connecting the stringers and passingthrough the hooked lugs of the risers and above the tread above said riser whereby said risers may be locked in engaging relation with each other and supported between the stringers by said tie-rods.

A stair form comprising strmgers; a plurality of stair forms mounted between said stringers and each comprising a riser and a tread formed integrally, there-- with, the top of each riserbeing provided with a hooked portion for engagingia tierod and apertured struck-uplugs at the lower portion of each riser for engaging a second tie-rod, the tread of each stair form a .ipair y restingupon thetopoi theadjacentvriser below it and tie-rods connectingthe stringers and engaging the hooked portions-and apertured lugs of the stair forms to support the same between said stringers 5. A stair StILICtUIG COmPITIS IDg a pair of stringers; tie-rods connected. between the stringers; and stair forms mounted between the stringers each, form consisting o'fan integrally formed tread and riser and pror vided with struck-up lugs formed thereon along the juncture of the tread and riser to engage adjacent tie-rods, vsaid tie-rods being arranged to support the forms and to connect the stringers andforms rigidly :toi gether. I I

, 7. A stair structure comprisinga pair of stringers; tie-rods connected between the stringers; stair forms mounted between the stringers and provided, with struck-up lugs formedthereon to engage adjacent tie-rods, said tie-rods being arranged to support the forms and to connect the stringers and forms rigidly together; and means formed upon each stair form to engage an adjacent form to lock said forms to tie rods and to each other.

8. A. stair structure comprising a pair of' stringers; a plurality of stair forms each consisting of an integrally formed tread and riser provided with struck-up lugs formed thereon, each lug being shaped to receive a tie-rod; and tie-rods connected between the stringers and engaging the lugs to support the forms and to connect the stringers and forms rigidly together. a

9. A stair structure comprising a pair of stringers; a plurality of stair forms each consisting of an integrally formed tread and riser provided with struck-up lugs formed thereon, each lug being shaped to receive a tie-rod; tie-rods connected between the stringers andengaging the lugs to support the forms and to connect the stringers and forms rigidly together; and lugs formed upon each form receivable through apertures formed in an adjacent forin'for locking said forms together.

10. In a stair structure. a stair form com prising an integrallyformed tread and riser, said form having a concave recess formed along the juncture of the tread and riser, and being provided with lugs struck up from the recess to receive a tie-rod.

11. In a stair structure, a stair form comprising an integrally formed tread and riser, said form having struck up lugs formed along the juncture of the tread and riser and also having hooks arranged to bemoved through apertures in an adjacent form, said lugs and hooks being arranged to receive tie-rods for supportingthe forms.

12. In a stair structure, a stair form com.-

prising integrally formed tread. and riser portions, each form being provided with hook portions arranged to be inserted through corresponding apertures formed in the adjacent portion of an. adjacent form, said hook portions being arranged to receive and engage tie-rods arranged to lock the forms in engaging relation and to support the forms.

13. In a stair structure, a stair form comprising integrally formed tread and riser portions, each form being provided with hook portions arranged to be inserted through corresponding apertures formed in the adjacent portion of an adjacent form, and also having a rearwardly oflset recess formed along the juncture of the tread and. riser portions of each form; tie-rods engaged by the hook portions to lock the forms together and to support the forms; and tie rods engaged within the recesses to further support the forms. 14. In a stair structure, a stair form comprising integrally formed tread and riser portions, each form being provided with a recess formed along the juncture of the tread and riser portions and extending the full length of the form; and. a tie-rod extending longitudinally within the recess and forming a support upon which the recessed portion of the form is seated.

In witness whereof I hereunto set my signature.

NATHANIEL 1301s. 

